Using Permanent Coffee Filters

There are several benefits to using permanent coffee filters. The following are some of the things that we find to be beneficial to using this type of coffee filter:

Improves the flavor of drip brewed coffee.
A permanent filter will eventually pay for itself as it is reusable.
Less waste. You do not have a filter that has to be thrown away each time you make coffee.
Save cabinet space since with a permanent filter you only have one instead of a large package of several filters.

Do you use a permanent coffee filter? If so, what do you like/dislike about them?